Subject: Maths, asked on 21/3/18

## No links please Q. In a Binomial (a, p) distribution show that ${{\sigma }_{x}}^{2}<\mu$ (where $\sigma {x}^{2}$ is variance and $\mu$ is mean of this distribution).

Subject: Maths, asked on 20/3/18

## lease answer this quickly Often it is taken that a truthful person commands, more respect in the society. A man is known to speak the truth 4 out of 5 times. He throws a die and reports that it is actually a six. Find the  probability that it is actually a six. Do you agree that the value of truthfulness leads to more respect in the society?

Subject: Maths, asked on 20/3/18

## Please answer this fast: Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he has A grade. What is the  probability that the student has 100% attendance? (i) Write any two values reflected in this question (ii) Is regularity required only in school? Justify your answer

Subject: Maths, asked on 20/3/18

## No links please: (i) For a binomial distribution, the mean and S.D. are respectively 4 and $\sqrt{3}$. Calculate the probability of getting a non zero value from this distribution.

Subject: Maths, asked on 20/3/18

## 3 cards are drawn successively with replacement from a well shuffled pack of 52 cards. Find the mean and variance of red cards. No link pls

Subject: Maths, asked on 20/3/18

## The probability that meditation will reduce heart attack is given by 0.30. Then why are we multiplying 0.70 instead of 0.30 with 0.40?

Subject: Maths, asked on 20/3/18

## Why that's written 2 times ?!..

Subject: Maths, asked on 20/3/18

## Solve this: EXAMPLE 6. Two balls are drawn from an urn containing 2 white, 3 red and 4 black balls one by one without replacement. What is the probability that at least one ball is red?

Subject: Maths, asked on 19/3/18

## Dear experts in a game a man wins for any other number when a die is thrown the man decided to throw a die thrice but to quit as soon as he gets a six find the expected value of amount he wins and loses here why are we not considering a situation when he does not get a six at all that is random variable is -3 no links please

Subject: Maths, asked on 19/3/18

## How do we get to know if it follows binomial distribution or not ?!.. Does every event follow it ?!.. [The image is just for reference, kindly take ANY example to explain this.]

Subject: Maths, asked on 19/3/18

## Dear experts find the probability distribution of no of success in 3 tosses of a die where success is defined as six appears on at least 2 dice . No links pls

Subject: Maths, asked on 19/3/18

## Why did we use P&C here ?!.. Couldn't we use multiplication theorem, like for finding P(X=0), couldn't we write 4/52* 4/52 ?!..

Subject: Maths, asked on 19/3/18

## While finding variance, we need to draw a table in the solution, in which we've xi, pi, etc. etc.. So I wanna know the columns we need to make in both of the formulae ?!.. [Just mention the columns, for BOTH the formulae.]

Subject: Maths, asked on 19/3/18

## So I hope now it's clear what I want for example 18. Kindly explain. (If table can't be drawn, then a tree diagram would also work.)

Subject: Maths, asked on 19/3/18

## Kindly draw a table for all the info. given in question. Just the table. 18. Suppose that the reliability of a HIV test specified as follows.       Of people having HIV, 90% of the test detect the disease but 10 % go underacted. Of people free of HIV, 99% of the test are judged HIV -ive but 1% are diagnosed as showing HIV +ive .From a large population of which only 0.1% have HIV, one person is selected at random, given the HIV test, and the pathologist reports him/her as HIV +ive. What is the probability that the person actually has HIV ?

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